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melonDS
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attempt at making local multiplayer faster

This commit is contained in:
Arisotura 2023-07-15 01:16:31 +02:00
parent 4b7c2ba8c2
commit 8772258fe7
1 changed files with 90 additions and 10 deletions
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100
src/Wifi.cpp
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@ -110,6 +110,7 @@ bool ForcePowerOn;
bool IsMPClient;
u64 NextSync; // for clients: timestamp for next sync point
u64 RXTimestamp;
int MPEarlyReply;
// multiplayer host TX sequence:
// 1. preamble
@ -264,6 +265,7 @@ void Reset()
IsMPClient = false;
NextSync = 0;
RXTimestamp = 0;
MPEarlyReply = 0;
WifiAP::Reset();
}
@ -577,7 +579,25 @@ void StartTX_Cmd()
else slot->Rate = 1;
slot->CurPhase = 0;
slot->CurPhaseTime = PreambleLen(slot->Rate);
PreTXAdjust(slot, 1);
// delay the frame to give clients time to catch up and respond
u16 clientmask = *(u16*)&RAM[slot->Addr + 0xC + 24 + 2];
int cmdtime = PreambleLen(slot->Rate) + (slot->Length * (slot->Rate==2 ? 4:8));
int replytime = 112 + ((10 + IOPORT(W_CmdReplyTime)) * NumClients(clientmask));
int acktime = 32 * (slot->Rate==2 ? 4:8);
int nlines = 186 - (int)GPU::VCount;
if (nlines < 0) nlines += 263;
int time = (nlines * 127) / 2;
if (time > CmdCounter) time = CmdCounter;
slot->CurPhaseTime = time - (cmdtime+replytime+acktime+128);
if (slot->CurPhaseTime < 96) slot->CurPhaseTime = 96;
int txlen = Platform::MP_SendCmd(&RAM[slot->Addr], 12 + slot->Length, USTimestamp + slot->CurPhaseTime);
WIFI_LOG("wifi: sent %d/%d bytes of MP CMD\n", txlen, slot->Length+12);
}
void StartTX_Beacon()
@ -641,7 +661,7 @@ void FireTX()
}
}
void SendMPDefaultReply()
void SendMPDefaultReply(u64 ts=0)
{
u8 reply[12 + 32];
@ -667,7 +687,7 @@ void SendMPDefaultReply()
*(u16*)&reply[0xC + 0x16] = IOPORT(W_TXSeqNo) << 4;
*(u32*)&reply[0xC + 0x18] = 0;
int txlen = Platform::MP_SendReply(reply, 12+28, USTimestamp, IOPORT(W_AIDLow));
int txlen = Platform::MP_SendReply(reply, 12+28, ts?ts:USTimestamp, IOPORT(W_AIDLow));
WIFI_LOG("wifi: sent %d/40 bytes of MP default reply\n", txlen);
}
@ -716,16 +736,21 @@ void SendMPReply(u16 clienttime, u16 clientmask)
IncrementTXCount(slot);
slot->CurPhase = 0;
PreTXAdjust(slot, 5);
int txlen = Platform::MP_SendReply(&RAM[slot->Addr], 12 + slot->Length, USTimestamp, IOPORT(W_AIDLow));
WIFI_LOG("wifi: sent %d/%d bytes of MP reply\n", txlen, 12 + slot->Length);
if (MPEarlyReply != 2)
{
PreTXAdjust(slot, 5);
int txlen = Platform::MP_SendReply(&RAM[slot->Addr], 12 + slot->Length, USTimestamp, IOPORT(W_AIDLow));
WIFI_LOG("wifi: sent %d/%d bytes of MP reply\n", txlen, 12 + slot->Length);
}
}
else
{
slot->CurPhase = 10;
SendMPDefaultReply();
if (MPEarlyReply != 2)
SendMPDefaultReply();
}
u16 clientnum = 0;
@ -738,6 +763,51 @@ void SendMPReply(u16 clienttime, u16 clientmask)
slot->CurPhaseTime = 16 + ((clienttime + 10) * clientnum) + PreambleLen(slot->Rate);
IOPORT(W_TXBusy) |= 0x0080;
MPEarlyReply = 0;
}
void SendMPEarlyReply()
{
if (MPEarlyReply != 1)
return;
u16 clienttime = *(u16*)&RXBuffer[12+24];
u16 clientmask = *(u16*)&RXBuffer[12+26];
if (!IOPORT(W_AIDLow))
return;
if (!(clientmask & (1 << IOPORT(W_AIDLow))))
return;
if (!(IOPORT(W_TXSlotReply1) & 0x8000))
return;
bool valid = true;
u16 addr = (IOPORT(W_TXSlotReply1) & 0x0FFF) << 1;
u16 len = *(u16*)&RAM[addr + 0xA] & 0x3FFF;
u16 rate = 2;
u16 rxrate = *(u16*)&RXBuffer[6];
u16 rxlen = *(u16*)&RXBuffer[8];
u64 ts = RXTimestamp + (rxlen * (rxrate==2 ? 4:8));
// the packet is entirely ignored if it lasts longer than the maximum reply time
u32 duration = PreambleLen(rate) + (len * (rate==2 ? 4:8));
if (duration > clienttime)
valid = false;
if (valid)
{
PreTXAdjust(&TXSlots[5], 5);
int txlen = Platform::MP_SendReply(&RAM[addr], 12 + len, ts, IOPORT(W_AIDLow));
WIFI_LOG("wifi: sent %d/%d bytes of MP reply\n", txlen, 12 + len);
}
else
{
SendMPDefaultReply(ts);
}
MPEarlyReply = 2;
}
void SendMPAck(u16 clientfail)
@ -885,14 +955,14 @@ bool ProcessTX(TXSlot* slot, int num)
IOPORT(W_RXTXAddr) = slot->Addr >> 1;
if (num == 1)
{
PreTXAdjust(slot, num);
{//printf("[%03d] actually send CMD\n", NDS::ARM7Read16(0x04000006));
/*PreTXAdjust(slot, num);
// send
int txlen = Platform::MP_SendCmd(&RAM[slot->Addr], 12 + slot->Length, USTimestamp);
WIFI_LOG("wifi: sent %d/%d bytes of slot%d packet, addr=%04X, framectl=%04X, %04X %04X\n",
txlen, slot->Length+12, num, slot->Addr, *(u16*)&RAM[slot->Addr + 0xC],
*(u16*)&RAM[slot->Addr + 0x24], *(u16*)&RAM[slot->Addr + 0x26]);
*(u16*)&RAM[slot->Addr + 0x24], *(u16*)&RAM[slot->Addr + 0x26]);*/
}
else if (num == 5)
{
@ -1561,6 +1631,9 @@ bool CheckRX(int type) // 0=regular 1=MP replies 2=MP host frames
// include the MP reply time window
NextSync += 112 + ((clienttime + 10) * NumClients(clientmask));
MPEarlyReply = 1;
SendMPEarlyReply();
}
}
else
@ -2023,6 +2096,7 @@ void Write(u32 addr, u16 val)
case W_AIDLow:
IOPORT(W_AIDLow) = val & 0x000F;
SendMPEarlyReply();
return;
case W_AIDFull:
IOPORT(W_AIDFull) = val & 0x07FF;
@ -2236,6 +2310,11 @@ void Write(u32 addr, u16 val)
FireTX();
return;
case W_TXSlotReply1:
IOPORT(W_TXSlotReply1) = val;
SendMPEarlyReply();
return;
case 0x228:
case 0x244:
//printf("wifi: write port%03X %04X\n", addr, val);
@ -2245,6 +2324,7 @@ void Write(u32 addr, u16 val)
case 0x000:
case 0x044:
case 0x054:
case 0x098:
case 0x0B0:
case 0x0B6:
case 0x0B8: